package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * User: haitao
 * Email: haitaoss@aliyun.com
 * Date: 2020/7/14
 * 在执行目标方法之前，判断用户的登录状态，并封装给controller目标请求
 * 整合spring boot 添加，拦截器只需要  1.implements HandlerInterceptor 2. 设置拦截器到我们的地方中
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     * 目标方法执行之前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo memberRespVo = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (memberRespVo != null) {
            // 用户登录
            userInfoTo.setUserId(memberRespVo.getId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                // user-key
                String name = cookie.getName();
                if (CartConstant.TEMP_USER_COOKIE_NAME.equals(name)) {
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        // 如果没有临时用户一定分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())) {
            String uuid = UUID.randomUUID().toString().replace("-", "");
            userInfoTo.setUserKey(uuid);
        }
        // 调用目标方法之前
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * handler 方法执行后
     * 业务执行之后；分配临时用户，让浏览器保存|
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 如果没有临时用户就保存一个临时用户
        UserInfoTo userInfoTo = threadLocal.get();
        if (!userInfoTo.isTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setMaxAge(60 * 60 * 24 * 30);
            cookie.setDomain("gulimall.com");
            response.addCookie(cookie);
        }


    }
}
